Process of dyeing half-woolen goods.



MANY, A CORPORATION OF GERMANY.

PROCESS OF DYEING HALF-WOOLEN GOODS.

No Drawing.

To all whom 'Li may concern:

Be 1t known that we, MAX BEoKn, colorlst Specification of Letters Patent. Application filed April 4, 1910.

and chemist, and ALBERT BEIL,Pl1.I).,Cllel1ll ist, citizens of the Empire of Germany, residing at Hochst on the -IvIain, Germany, have invented certain new and useful Improvements in the Process of Dyeing Half- WVoolen Goods, of which the following is a specification.

In further elaborating the invention de scribed in U. S. Patent N 0. 815,671, we have discovered a process for dyeing half-woolen spun goods and woven goods which offers considerable technical advantages over the methods hitherto used for dyeing halfwoolen goods.

As is known, the two most important methods of dyeing half-woolen goods are 1 process consists in firstly: the older, so-called three-baths method, which consists in dyeing the wool fiber with acid dyestulfs, subsequently mordanting the cotton fiber with tannic substances and metallic salts, and finally dyeing with basic dyestuffs; secondly: the singlebath method, according to which directdyeing dyestuffs are used. The older method has, as is known, the disadvantage of being intricate and easily wear off by rubbing, whereas the single-bath method has various disadvarr tages, namely: that it renders the goods flabby to the touch, that in many kinds of goods the wool-cover becomes uneven, and that the fact that the wool has a greater tendency to absorb the dye than the cotton renders it very ditficult to obtain exactly the desired tints, which applies to onecolored (plain) dyeings as well as to contrast-dyeings The above-mentioned drawbacks are remedied by the new process discovered by us, which consists in dyeing the wool fiber and impregnating it with tannic substances and a metallic salt, so that when the cotton fiber is subsequently dyed the capability of the wool fiber to further absorb the dyestufi' is diminished or removed.

The procedure is as follows: The half woolen fabrics or spun goods are first dyed the tint desired for the wool fiber with a dyestutt' dyeing in the boiling acid bath, to which tannin or another tannic substance is added. To this dye-bath tartar emetic or another metallic salt is then added and the tannic Patented June 20, 1911. Serial No. 553,331.

substance thus fixed. Thereupon the cotton fiber is dyed with a direct cotton dyestuif in a hot bath to which Glauber salt or common salt is added, in which operation it is possible to dye the cotton any desired tint without alfecting in any way the dyeing of the wool-fiber, which is not possible by the hitherto known processes; it follows that the new method can be applied both for dyeing half-woolen spun goods and woven goods one-colored tints and for producing any desired two-colored effects. The metallic 1 salt to be used for fixing the tannin may also giving dyeings which 1 be added in a separate bath or in the dye bath in which the dyeing with cotton dyestutls is carried out.

A particular method of carrying out the dyeing halfwoolen goods which besides wool (or shoddy) and cotton fibers also contain previously-dyed wool fibers treated according to the process described in U. S. Patent No. 815671. In this case multi-colored effects are obtained in half-woolen goods.

The following examples will illustrate the method of working, the percentages given therein being based on the weight of the goods:

Example I: A half-woolen weft of which consists warp of worsted yarn, in a boiling bath containing 2% of sulfuric acid, 2% of new coccine O, 20% 0f Glauber salt and 5% of tannin; to this bath are added 3% of tartar emetic and the dyeing continued for another half hour. Then the fabric is brought into a second bath prepared with 50% of Glauber salt, 29 of dianil-blue G' and 1% of tartar'emetic. The fabric is dyed at about 60 for one hour, rinsed, hydro-extracted, dried, dressed and finished. Thus a fabric is produced the wool fibers of which show a pure very bright scarlet and the cotton fibers a pure blue tint. In a similar manner any desired contrast in color may be produced by using, for the dyeing of the wool fiber, acid dyestuffs or combinations of such dyestuffs, which do not dye cotton fibers; while for the dyeing of the cotton fiber, direct-dyeing dyestuffs, particularly those which are highly sulfonated and of good solubility, are used. The process may also be carried out by adding the tannic substance only after the dyefabric, the of cotton yarn and the is dyed for one hour stuff has been absorbed. The metallic salt to be used for fixing the tannic substance may be added in a separate bath or in the second dye-bath containing the cotton dyestuff, instead of in the first bath. I

Example II: A fabric, the weft of which consists of cotton yarn and the warp of shoddy, is dyed by boiling it for one and a half hours in a bath containing 2% of sulfuric acid, 10% of Glauber salt, 2-}% of aminoblack E and 5% of tannin. The fabric is then entered into a second bath prepared with 2% of concentrated patentdianil-black EF cone, 50% of Glauber salt and 3% of tartar emetic, in which the cotton fiber is dyed at about (SO-70. The dyeing thus obtained is of uniform black, fast to rubbing. The fabric has a full handle and a high luster.

Example III: Some pearl-yarn, twisting worsted yarn with cotton first dyed, as to its wool, navy-blue, by handling it for one hour in a boiling hot bath containing 2% of naphthalene-blue B, 5% of tannin, 2% of sulfuric acid and 10% of Glauber salt then the cotton fiber is dyed bright yellow by treating it at 60 C. in a second bath prepared with 2% of dianildirect-yellow S, 50% of Glauber salt and 3% of tartar emetic. Instead of the naphthalene-blue, any azo or acid dyestuff which does not dye cotton may be used, and in stead of the dianildirectyellow, any readily-soluble and highly-sulfonated direct dyestuff.

Example IV: An alpaca-like, half-woolen fabric, containing for instance yellow, red and green efiect threads of wool-yarn which before being woven having been rendered incapable of absorbing any further dyestufi' by means of tannin and tartar emetic,according to British specification No. 19668/ 1900-, is dyedfor one and a half hours in a bath heated to 90 2% of azo-acid-black 3BE and O, 2% of tartrazin, to which were added 20% of Glauber salt, 12% of acetic acid of 8 Be. and 5% of tannin; the fabric is then again dyed in a second bath heated to 60 and containing 2% of patent-dianil-black EB 50% of Glaumade by yarn, is-

C. and containing ber salt and 3% of tartar emetic. The wool and cotton fibers are thus dyed a black ground-color and the fabric has a full handle and a remarkable luster and exhibits bright red, yellow and green wool effects.

According to the selection of the dyestuffs to be used in the first and second bath, very different ground colors may be obtained. Furthermore, conformably with Examples I and III, the wool fibers contained in the fabric may be dyed in tints such as navy blue Russian green, or brown, while the cotton fibers have black shades; or the wool and cotton fibers may be dyed other contrast colors, while the interwoven wool effects retain their color both in the first bath, containing wool dyestuffs, and in the second bath, containing cotton dyestuffs.

Having now described our invention, what we claim is: V

l. The hereindescribed process of dyeing mixed wool and cotton spun and woven goods, in such a manner that the wool fibers and cotton fibers are dyed the same tints or contrasting tints, which consists in dyeing the wool fibers with acid dyestuffs, rendering them incapable of absorbing any further dyestuff by treating with a tannic substance and a metallic salt, and dyeing the cotton fibers in a hot bath with a direct color.

2. The herein-described process of dyeing mixed wool and cotton spun and woven goods containing previouslydyed wool fiber effects treated with a tannic substance and a metallic salt, in such manner that the undyed wool fibers and cotton fibers are dyed the same tints or contrasting tints, which consists in dyeing the undyed wool fibers with acid dyestuffs, rendering them incapable of absorbing any further dyestuif by treating with a tannic substance and a metallic salt, and dyeing the cotton fibers in a hot bath with direct colors.

In testimony whereof, we afiix our signatures in presence of two witnesses.

MAX BECKE. ALBERT BEIL.

lVitnesses J EAN GRUND, CARL GRUND.

Copies of this patent may be obtained for five cents each, by addressing the.

Commissioner of Patents,

Washington, D. G. 

